Cotton Imported Ideal Swaddle Transition: Baby Merlins magic sleepsuit 3-6 months helps your baby move towards independent sleep, fostering healthy sleep habits for optimal growth and development; small (12-18 lbs) Safe Design for Back Sleeping: The baby sleep suit is crafted for back sleeping in cribs, ensuring safety and effectiveness when introduced at the right time and fit for your bab Comfort and Easy Care: Made from soft, breathable cotton with polyfill layer, this baby swaddle 3-6 months is machine washable with a double zipper for quick diaper changes without removing the sack. Baby worn for about a week. Washed once.